Hydrocotarnine is an alkaloid found in plants such as the Chinese herbal medicine Corydalis yanhusuo. It has been studied for its potential medicinal properties, including pain relief and anti-inflammatory effects. Synonyms for hydrocotarnine include corypalmine, corydine, tetrahydropalmatine, and leonticinine. These compounds have similar structures and may have similar biological activity to hydrocotarnine. Tetrahydropalmatine, in particular, is commonly used to treat anxiety and insomnia in traditional Chinese medicine. While more research is needed to fully understand the potential benefits and risks of these compounds, studying their synonyms may lead to the discovery of new therapeutic agents.